Thermostat



July 1s, 1933. L, M PERSONS 1,918,778

THERMOSTAT Filed July 2l, 1930 Patented July 18,1933 1,918,778

UNITED STATES-` PATENT OFFICE LAURENCE M. PERSONS, OF ST. LOUIS,MISSOURI THERMOSTAT Application led .Tuly 2 1, 1930. Serial No.'469,353.

My invention relates to control means for air, the temperature controlunit shown in a heating plant or furnace. One object is Some detail inFigure 2. It may include, the provision of temperature control means forexample, a housing C within which is po for the control of aroom'temperature. Ansitioned a pin C1 to which in turn is secured 5other object is the provision of such means the bimetallic strap or coilC2. This coil may 55 which shall be unaffected by hot pipes in aterminate in a contact member C, preferably house wall or drafts fromthe` outside wall. of a material or metal responding to mag- Anotherobject is the provision of temperanetic attraction. C4 indicates an armpivoted ture control means for a hot air heating sys- 1n relation to thehousing C. Mounted therew tem. Other objects will appear from time to11pon is a permanent magnet C5 adjustably 60 time in the course of thespecification and aSSOClated withacontact member Q, opposed Claims, i toa c ontact'stud C7 upon themember G3.

I illustrate my invention more or less dia- The blmetallic st rap C2 andthe contact C girammatjcally in the accompanying drawmay be included inany Suitable electric CI- ing, wherein.. cuit, which may lncludeithelines C8 C9 and 05 Figure 1 is a vertical section illustrating which maybe employed to actuate any suitmore or less diagrammatically a hot airheatable Control means F, F, for the furnace, such ing System, and asdampervcontrols or the like, the details yFigure 2 is a, section througha temperaof which form no part of the present inventure Contro] unittion and are, therefore not illustrated herein. 7

Like parts are indicated by like symbols It will be understood that thebimetallic throughout the specification and drawing. Strap 02, WhlChlXeS 1n response tovaria- Referring to the drawing, A generally intions1n the temperature to which it 1s subdicates the Hoor of abasement. A1indicates Jected, acts as a make and break member,

5 a hot air furnace positioned within the basewhereby the tllatllgCllCllit .lllIOllgglll the 75 ment from whichlextend hot air supplylines 11I1S C8 C may be made 01 hIOleIlA as in re- A2 and the flue A3.A* is a cold air rturn spouse to fluctuations of the temperature ofline. It is thought to be unnecessary to enthe alr to whlch thetemperature control ter into the details of the hot air heating means 1SSubiepted, If the present Structure svstem since such systems are wellknown, 1S employed With a mechanical draft control, 30 and my presentdescription and drawing will the devlce may be set so that when a pre?be understood to be largely diagrammatic d etermmed low temperature isreached, the or illustrative, so far as relates to the show- CllllltthI'Ough the member C C9 is closed ing of the heating system.. It willbe underand theJ drafts are opened. When a prestood that hot air issupplied through the determined high temperature is reached, the 85duets A2 to various parts of the room or clrcult may again he broken andthe draft house to be heated, and that cold air returns control beclosed to shut off the draft. through the passage A* for reheating, Inorder to provide for ready adjustment,

il1ustrate a floor B in which is positioned I employ alever D whichprojects upwardly 40 the `cold air register structure generallyinthrough a slot D1 in a cover D2 with the '90 dicated as B1. It mayinclude a frame or housing C. It may terminate, for example, housing B2with the rim Bs flush with the in aball D3, or in any other member ofproper iioor B. Associated with the rim B3 may size and shape, to becontacted by the foot of be any suitable pervious member B4. It will theoperator. The lever D is pivoted as at be understood that the cold' airmay flow Dl and is provided with a slot D5 toreceive 95 downwardlythrough the pervious member a pin l)6 upon the arm C4. It will be under-B and through the housing B2 and the cold stood that rotation of thelever D effects a air return passage A4L to the furnace. slight rotationof the arm C4, thus varying I position in association with the registeror adjusting the temperature at which con- B1, and thus in the path ofthe returning cold tact between the members C6 CA'is madeor 10 broken.'Ihe permanent magnet C5 hel s in insuring a quick or further action othe` making or breakin ofthe'actuating circuit. It does not, of itselform part of the present invention and is not necessary for itsoperation. To conform to underwri requirements a transformer G, to stdown the current, may be interposed between the thermostat and the ener'zingvcircuit G1.

It will be realizel that whereas I have described and shown a practicaland operative device, that nevertheless many chan es maybe made in size,shape, number and isposition of parts. I therefore wish my drawing to betaken as in a broad sense illustrative and diagrammatic, and do not wishto be limited'to my showing herein in detail, except so far as Iprecisely limit myself in my claims.

I claim: i

1. In combination with hot air heating sysv. of the foot of an o tem,which includes hotair supply lines and a cold air return line, a,register, and temerature responsive control means positioned v 1n thecold aix-return line' adjacent said reg- LAUR NGE M. PERSGNS.

